NEETBotanyPlant - Growth and Development
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The gaseous plant growth regulator that promotes female flowers in cucumbers also helps plants to increase their absorption surface. Reason (R): This hormone promotes root growth and root hair formation. In the light of the above statements, choose the most appropriate answer from the options given
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
The gaseous plant growth regulator being referred to is ethylene, which is known to promote female flowers in cucumbers, thereby increasing the yield. Assertion (A) is true because ethylene helps plants to increase their absorption surface. Reason (R) is true because ethylene achieves this by promoting root growth and root hair formation. The formation of root hairs directly increases the surface area available for absorption of water and minerals. Thus, both (A) and (R) are true, and (R) correctly explains how the